I simply think the company that is going to increase mass adoption is Facebook, through Oculus and The Vision Lab, Facebook has positioned Oculus such that you can only log in with FB Auth, this is kind of intentional, and perhaps we can think of the Metaverse as the next killer app.
Since the AR glasses are coming from Apple soon that is going to make AR a house-hold product like the smart-speakers and thus increase appetite for VR. VR needs to be reduced in hardware and portability to be relevant to everyday users. I think this question is interesting but not easy to answer, if you asked in 2018, when will NFT's reach mass adoption, people might have said, not until crypto itself reaches that scale, however we saw this year, they became a household name, whether bubble or not. I think once people find utility of VR except gaming, then they will take it seriously, if you could make money in VR as a remote worker for example. It's not so predictable, I think network effects can play interesting roles, and they are often black swans. If I were to stretch my imagination, it would be something like 2025, purporting that hardware would have been reduced and developed further.